A
XC6371/XC6372
Series
ETR0402_004
PWM,PWM/PFM Controlled Step-up DC/DC Converters
■GENERAL DESCRIPTIO N
The XC6371/XC6372 series is a group of PWM controlle d and PWM/PFM controll ed step-up DC/DC converters. T he built-in
1.4Ω switching transistor type enables a step-up circuit to be configured using only three compone nts, a coil, a diode, and a
capacitor.
Output voltage can be selectable in the range from 2.0V to 7.0V in increments of 0.01V (accuracy:±2.5%). Oscillation
frequency is also selectable from 50kHz, 100kHz, and 180kHz (accuracy: ±15%) for the XC6371 and the XC6372 series.
Soft-start time is internally set and offers protection against in-rush currents when the power is switched on and pr events
voltage overshoot. Packages with CE (chip enable) pin are also available which can reduce the IC power consumption
during during stand-by mode.
The XC6371 series is the standard PWM controlled products. The control of the XC6372 series switches from PWM to PFM
control during light loads when automatically switching is selected and the series is highly efficient from light loads to large
output currents.
■
PPLICATIONS
●Cellular phones, Pagers
●Palmtops
●Cameras, Video recorders
●Portable products
■FEATURES
Operation Start Voltage Range
Output Voltage Range : 2.0V~7.0V (0.1V increments)
Highly Accurate : ±2.5%
Oscillation Frequency :
Maximum Output Currents
Highly Efficient : 85%(TYP.) @ V
Built-in switching transistor.
CE pin type (XC6371C, XC6372C)
Phase compensation and soft start-up circuits built-in
CMOS Low Power Consumption
Packages : SOT-89, SOT-89-5, USP-6B
Environmentally Friendly: EU RoHS Compliant, Pb Free
* Performance depends on external components and PCB layout.
■
TYPICAL APPLICATION CIRCUIT
■TYPICAL PERFORMANCE
☆GreenOperation Compatible
: 0.9V~10V
50kHz, 100kHz, 180kHz (±15%)
: 100mA(TYP.) @ VIN=3.0V, VOUT=5.0V *
IN=3.0V, VOUT=5.0V *
1/17
XC6371/XC6372
■PIN CONFIGURATION
Series
■PIN ASSIGNMENT
XC6371/XC6372A
PIN NUMBER
SOT-89 USP-6B
PIN NAME FUNCTION
*The dissipation pad for the USP-6B
package should be solder-plated in
recommended mount pattern and metal
masking so as to enhance mounting
strength and heat release. If the pad needs
to be connected to other pins, it should be
connected to the pin No.1.
1 6 VSS Ground
2 1 VOUT
Output Voltage Monitor/IC Internal Power Supply
3 4 Lx Switch
－
XC6371/XC6372C
SOT-89-5 USP-6B
PIN NUMBER
2, 3, 5 NC No Connection
PIN NAME FUNCTION
5 6 VSS Ground
2 1 VOUT Output Voltage Monitor/IC Internal Power Supply
4 4 Lx Switch
3 3 CE Chip Enable
1 2, 5 NC No Connection
2/17
r
■PRODUCT CLASSIFICATION
●Selection Guide
START
PWM XC6371
Standard
Chip Enable
PWM/PFM XC6372
Standard
Chip Enable
●Ordering Information
XC6371①②③④⑤⑥-⑦
XC6372①②③④⑤⑥-⑦
DESIGNATOR DESCRIPTION SYMBOL DESCRIPTION
①
(*1)
: PWM controlled
(*1)
: PWM/PFM switching control
Type of
DC/DC Converter
A 3-pin DC/DC converter with built-in switching transistor
C Stand-by capability with built-in switching transistor
XC6371/XC6372
Series
XC6371A
XC6371C
XC6372A
XC6372C
②③
Output Voltage Integer
OUT=3.5V→②=3, ③=5
e.g. V
0 50kHz
④
Oscillation Frequency
1 100kHz
2 180kHz
SOT-89 (XC6371/72 A type)
SOT-89-5 (XC6371/72 C type)
SOT-89 (XC6371/72 A type)
SOT-89-5 (XC6371/72 C type)
⑤⑥-⑦
Packages
Taping Type
(*2)
PR
PR-G
DR USP-6B
DR-G USP-6B
(*1)
The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.
(*2)
The device orientation is fixed in its embossed tape pocket. For reverse orientation, please contact your local Torex sales office o
representative. (Standard orientation: ⑤R-⑦, Reverse orientation: ⑤L-⑦)
3/17
A
(p)
XC6371/XC6372
■BLOCK DIAGRAMS
XC6371/XC6372A, C
■
OUT pin serves also as VDD)
(The V
Lx
VLx li miter
Buffer
V
SS
EXT
Note: The CE pin is only used with the XC6371C.
PWM Control
OSC 50/100 /180KHz
Chip Enable
XC6371/72/73E
Lx
Buffer
V
SS
EXT
Note: Built-in transistor type units use the Lx pin.
PWM Control
OSC 50/100 /180KHz
BSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL RATINGS UNITS
VOUT Input Voltage VOUT 12 V
LX pin Voltage VLX 12 V
LX pin Current ILX 400 mA
CE Input Voltage VCE 12 V
SOT-89,
Power Dissipation
VDD Input Voltage VDD 12 V
Operating Temperature Range Topr
Storage Temperature Range Tstg
SOT-89-5
USP-6B
Series
CE
VLx limiter
Soft Start
Vref
Phase co mp
+
－
Soft S tart
Vref
Phase comp
－
+
Pd
DD
V
V
OUT
V
DD
V
DD
V
OUT
Ta=25℃
500
mW
100
-30~＋80 ℃
-40~＋125 ℃
4/17
,
XC6371/XC6372
Series
■ELECTRICAL CHARACTERISTICS
XC6371/72A501
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Output Voltage VOUT 4.875 5.000 5.125 V
Maximum Input Voltage VIN 10 - - V
Operation Start Voltage VST1 External Components Connected, IOUT=1mA - - 0.90 V
Oscillation Start Voltage VST2
No Load Input Current IIN
Supply Current 1 IDD1
Supply Current 2 IDD2
Lx Switch-On
Resistance
Lx Leak Current ILXL No external components. VOUT=VLX=10V - - 1.0
Oscillation Frequency FOSC Same as IDD1. Measuring of Lx waveform 85 100 115 kHz
Maximum Duty Ratio MAXDTY Same as IDD1. Measuring of Lx waveform 80 87 92 %
PFM Duty Ratio
Lx Limit Voltage VLXLMT
Efficiency EFFI - 85 - %
Slow-Start Time TSS 4.0 10.0 20.0 ms
NOTE: Unless otherwise stated, VIN=VOUT×0.6, IOUT=50mA. See Typical Application Circuits, Circuit1
*1: The Schottky diode (SD) must be type MA735, with reverse current (IR)<1.0μA at reverse voltage (VR)=10.0V.(XC6372A)
*2: "Supply Current 1" is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically
operates which results in less average power consumption. The current actually provided by an external V
"No Load Input Current (I
*3: When PWM operates at PWM Mode.
*4: When PFM operates at PFM Mode.(XC6372A)
OUT=5.0V
V
FOSC=100kHZ
No external components. Apply voltage to VOUT
Lx : 10kΩ pull-up to 5V
IN=VOUT×0.8, IOUT=0mA
V
(*1)
Same as VST2,
Apply output voltage×0.95 to VOUT
Same as VST2,
Apply output voltage×1.1 to V
OUT
Ta=25℃
- - 0.80 V
- 12.8 25.7
- 80.2 133.8
- 8.2 16.5
RSWON Same as IDD1, VLX=0.4V - 1.4 2.4
(*4)
PFMDTY Same as IDD1. Measuring of Lx waveform 10 17 25 %
Same as IDD1. Apply output voltage to Lx,
Voltage required to produce FOSC×2
IN)".
0.7 - 1.3 V
IN source is represented by
μA
μA
μA
Ω
μA
5/17
)
XC6371/XC6372
■ELECTRICAL CHARACTERISTICS (Continued
XC6371/72C501
Series
V
OUT=5.0V, FOSC=100kHz Ta=25℃
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Output Voltage VOUT 4.875 5.000 5.125 V
Maximum Input Voltage VIN 10 - - V
Operation Start Voltage VST1 External Components Connected, IOUT=1mA - - 0.90 V
Operation Start Voltage VST2
No Load Input Current IIN
Supply Current 1 IDD1
Supply Current 2 IDD2
Lx Switch-On
Resistance
R
SWON Same as IDD1, VLx=0.4V - 1.4 2.4
Lx Leak Current ILXL No external components, VOUT =VLX=10V - - 1.0
No external components. Apply voltage to VOUT,
Lx : 10kΩ pull-up to 5V
IN=VOUT×0.8, IOUT=0mA
V
(*1)
Same as VST2,
Apply output voltage×0.95 to VOUT
Same as V
Apply output voltage×1.1 to V
ST2,
OUT
- - 0.80 V
- 12.8 25.7
- 80.2 133.8
- 8.2 16.5
μA
μA
μA
Ω
μA
Oscillation Frequency FOSC Same as I DD1, Measuring of Lx waveform 85 100 115 kHZ
Maximum Duty Ratio MAXDTY Same as IDD1, Measuring of Lx waveform 80 87 92 %
PFM Duty Ratio
Stand-by Current ISTB Same as IDD1 - - 0.5
(*4)
PFMDTY Same as IDD1, Measuring of Lx waveform 10 17 25 %
μA
CE "High" Voltage VCEH Same as IDD1, Lx Oscillation start 0.75 - - V
CE "Low" Voltage VCEL Same as IDD1, Lx Oscillation stop - - 0.20 V
CE "High" Current ICEH
Same as I
DD1, VCE=VOUT×0.95
CE "Low" Current ICEL Same as IDD1, VCE=0V - - -0.25
Lx Limit Voltage VLxLMT
Same as IDD1, Apply output voltage to Lx,
Voltage required to produce FOSC×2
- - 0.25
μA
μA
0.7 - 1.3 V
Efficiency EFFI - 85 - %
Slow-Start Time TSS 4.0 10.0 20.0 ms
NOTE: Unless otherwise stated, connect CE to VOUT, VIN=VOUT×0.6, IOUT=50mA. See Typical Application Circuits, Circuit 2.
*1: The Schottky diode (SD) must be type MA735, with reverse current (I
*2: "Supply Current 1" is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically
operates which results in less average power consumption. The current actually provided by an external VIN source is represented by
"No Load Input Current (I
*3: When PWM operates at PWM Mode.
*4: When PFM operates at PFM Mode.(XC6372C)
IN)".
R)<1.0μA at reverse voltage (VR)=10.0V.(XC6372C)
6/17
(
)
(
)
■TYPICAL APPRICATION CIRCUITS
Circuit 1: XC6372A series Circuit 2: XC6372C series
L : 100μH (CR54, SUMIDA) L : 100μH (CR54, SUMIDA)
L : 100μH (CR54, SUMIDA)
SD : MA2Q735 (Schottky Diode; MATUSHITA)
C
L : 16V47μF
Tantalum Capacitor, NICHICHEMI MCE
SD : MA2Q735 (Schottky Diode; MATUSHIT A)
C
L : 16V 47μF
XC6371/XC6372
Series
Tantalum Capacitor, NICHICHEMI MCE
7/17
R
0
R
R
XC6371/XC6372
Series
■TYPICAL PERFORMANCE CHARACTERISTICS
(1) Output Voltage vs. Output Current
（V）
OUT
5.2
5.1
5.0
XC6371A501P
L＝100μH(CR54),CL＝47μF(Tantalum)
1.5V1.2V
V
IN
=0.9V
2.0V
4.0V
3.0V
XC6371A301PR
3.10
3.05
3.00
V
L＝100μH（CR54），C
IN
=1.0V
1.2V
4.9
Output Voltage:V
4.8
0.1 1 10 100 1000
Output Current:I
OUT
（mA）
2.95
Output Voltage:VOUT（V）
2.90
0.1 1 1 0 100 1000
Output Current:IOUT（mA）
5.2
（V）
5.1
OUT
5.0
4.9
Output Voltage:V
4.8
XC6372A501P
L＝100μH（CＲ54），CL＝47μF（Tantalum）
1.5V
V
IN
1.2V
=0.9V
0.1 1 10 100 1000
Output Current:I
OUT
2.0V
3.0V
4.0V
1000
(mA)
XC6372A301P
3.10
（V）
3.05
OUT
3.00
2.95
Output Voltage:V
2.90
L＝100μH（CＲ54），CL＝47μF（Tantalum）
VIN=0.9V
0.1 1 10 100 100
Output Current:I
L
＝47μF（Tantalum）
1.5V
2.7V
1.5V
1.2V
OUT
(mA)
1.8V
1.8V
2.7V
8/17
0
R
0
R
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(2) Efficiency vs. Output Current
XC6371A501P
100
80
60
40
20
Efficiency:EFFI(%)
L＝100μH(CR54),CL＝47μF(Tantalum)
IN
=0.9V
V
1.2V
0
0.1 1 10 100 100
Output Current:I
OUT
1.5V
（mA）
2.0V
4.0V
3.0V
1000
XC6371A301P
100
80
60
40
20
Efficiency:EFFI(%)
L＝100μH(CR54),CL＝47μF(Tantalum)
2.7V
IN
=0.9V
V
1.2V
1.5V
1.8 V
0
0.1 1 10 100 100
Output Current:I
OUT
（mA）
1000
XC6371/XC6372
Series
9/17
0
R
r
XC6371/XC6372
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(3) Ripple Voltage vs. Output Current
Series
XC6371A301P
100
80
（mVp-p）
60
40
20
Ripple Voltage:V
L＝100μH(CR54),CL＝47μF(Tantalum)
1.8V
1.5V
1.2V
VIN=0.9V
0
0.1 1 10 100 100
Output Current:I
OUT
2.7V
(mA)
1000
10/17
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(4) No Load Input Current vs. Input Voltage
XC6372A501PR
200
150
(μA)
IN
100
50
Input Current:I
L＝100μH（CＲ54），CL＝47μF（Tantalum）
0
012345
Input Voltage:VIN (V)
XC6371A301PR
500
400
(μA)
IN
300
200
100
Input Current:I
L＝100μH（CＲ54），CL＝47μF（Tantalum）
0
01
Input Voltage:VIN (V)
23
XC6371/XC6372
Series
11/17
XC6371/XC6372
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(5) Operation Start Voltage / Hold Voltage vs. Output Current
(6) Load Transient Response
Series
12/17
■PACKAGING INFORMATION
●SOT-89
●USP-6B
XC6371/XC6372
Series
●SOT-89-5
13/17
XC6371/XC6372
■PACKAGING INFORMATION (Continued)
●USP-6B Reference Pattern Layout
Series
●USP-6B Reference Metal Mask Design
14/17
(
■MARKING RULE
[XC6371/XC6372]
●SOT-89, SOT-89-5
②①
123
SOT-89
(TOP VIEW)
④③
SOT-89-5
TOP VIEW)
XC6371/XC6372
Series
① represents product series
MARK PRODUCT SERIES MARK PRODUCT SERIES
A XC6371A 1 XC6372A
A XC6371C 1 XC6372C
② represents integer of output voltage and oscillation frequency
OUTPUT VOLTAGE (V)
1.x B 1 1
2.x C 2 2
3.x F 3 3
4.x E 4 4
5.x F 5 5
6.x H 6 6
7.x K 7 7
③ represents decimal number of output voltage and oscillation frequency
OUTPUT VOLTAGE (V)
x.0 0 0 A
x.1 1 1 B
x.2 2 2 C
x.3 3 3 D
x.4 4 4 E
x.5 5 5 F
x.6 6 6 H
x.7 7 7 K
x.8 8 8 L
x.9 9 9 M
④ represents production lot number
0 to 9, A to Z repeated (G, I, J, O, Q, W excluded).
OSCILLATION FREQUENCY
50kHz 100kHz 180kHz
OSCILLATION FREQUENCY
50kHz 100kHz 180kHz
15/17
XC6371/XC6372
■MARKING RULE (Continued)
[XC6371/XC6372] (Continued)
●USP-6B
Series
① represents product series
② represents product classification
USP-6B
(TOP VIEW)
③④ represents output voltage (ex.)
⑤ represents oscillation frequency
⑥ represents production lot number
0 to 9, A to Z repeated (G, I, J, O, Q, W excluded)
Note: No character inversion used.
MARK PRODUCT SERIES
5 XC6371xxxxDx
2 XC6372xxxxDx
MARK PRODUCT SERIES
A
C
MARK
③ ④
3 3 3.3
5 0 5.0
MARK OSCILLATION FREQUENCY (kHz)
0 50
1 100
2 180
XC6371A
XC6371C
OUTPUT VOLTAGE (V)
16/17
XC6371/XC6372
Series
1. The product s and product specifi cations containe d herein are subject to change without
notice to improve performance characteristics. Consult us, or our representatives
before use, to confirm that the information in this datasheet is up to date.
2. We assume no responsibility for any infringement of patents, patent rights, or other
rights arising from the use of any information and circuitry in this datasheet.
3. Please ensure suitable shipping controls (including fail-safe designs and aging
protection) are in force for equipment employing products listed in this datasheet.
4. The products in this datasheet are not developed, designed, or approved for use with
such equipment whose failure of malfunction can be reasonably expected to directly
endanger the life of, or cause significant injury to, the user.
(e.g. Atomic energy; aerospace; transport; combustion and associated safety
equipment thereof.)
5. Please use the products listed in this datasheet within the specified ranges.
Should you wish to use the products under conditions exceeding the specifications,
please consult us or our representatives.
6. We assume no responsibility for damage or loss due to abnormal use.
7. All rights reserved. No part of this datasheet may be copied or reproduced without the
prior permission of TOREX SEMICONDUCTOR LTD.
17/17
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